Production of phosphorus pentoxide and phosphoric acid



Jan. 29, 1929.

G. PISTQR' ET AL PRODUCTION F PHOSPHORUS PENTOXIDE AND PHOPHORIC ACID Filed Oct. 11. 1926 [nz/eh/ors: 505201; P119101; Haber] Surly, Hermann Lan g.

Patented Jan. 29, 1929.

UNITED STATES GUSTAV PISTOR, HERMANN LANG, AND ROBERT SUCHY, OF BITTERFELD, GERMANY, ASSIGNOES TO THE FIRM I. G. FABBENINDUSTRIE AKTIENGFSELLSCHAFT, OF

FRAnKnoRr-oN-Tnn- Am, GERMANY;

PRODUCTION OF PHOSPHORUS PENTOXIDE AND PHOSPHORIC ACID.

Application filed October 1 1, 1926, Serial No. 141,025, and in Germany October 22, 1925.

combustion heat, is heated to a high temperature and is evaporated so rapidly that the available quantity of air does not suffice to attain a complete combustion; on the other hand the surface of the phosphorus is coatedv with lower oxidation productsand also with phosphoric acid, if the combustion air is moist, whereby a uniform combustion is prevented.

It has already been proposed to burn phosphorus with the aid of a wick (German patent specification No. 110,174), but even this method cannot be carried out on a large scale with ample eflicienc'y and certainty.

In contradistinction to what is known we have found that any desired quantity of phosphorus can be burnt without difiiculty by employing nozzles to which molten phosphorus is supplied in the form of a liquid combustible. Preferably burners provided with nozzles of the type used for oil-burners are employed. The molten phosphorus may be supplied to the nozzle from an elevated vessel by its own hydrostatic pressure or by any pumping device.

An apparatus for carrying out our improved method is diagrammatically illustrated in the annexed drawing, of which Fig. 1 is a sectional view of the burner and Fig. 2 is a sectional view of the whole plant.

The burner a comprises an inner tube 6 endi communicates th ing in a 'nozzle, 0 through which the liquid phosphorus is fed. The tube 6 is surrounded by a wider tube 'd the lower end of which is contracted to form an annular slot 6 around the nozzle 0. The combustion air is introduced through a tubu'lure f and ejected through slot e; This construction of a burner is old in the art of oil-heating and forms no part of our invention.

g in Fig. 2 is the container for liquid phosphorus from which the feeding pipe 1) issues.

' The burner a is inserted into the top wall/t of the combustion chamber 71 consisting of an upper cylindrical and a lower conical part is and Zrespectively. The combustion chamber ugh a pipe on with a collector at having the -me form asthe combustion chamber and provided near the top with a pipe 0 for carrying away the waste gases. The phosphorus pentoxide is withdrawn by valves 19 and p and may be collected in a lorry The combustion chamber 11 may be cooled by water flowing in the form of a thin film out of an annular reservoir 1", open at the bottom, and collecting in an annular reservoir 3 provided with an outlet t. We claim The method of producing phosphorus pen- I toxide and phosphoric acid by the combustion of yellow phosphorus, comprising passing molten phosphorus through nozzles and burning the jets of phosphorus thus produced.

In testimony whereof we aflix our signatures.

GUSTAV PISTOR. ROBERT SUCHY. I-IERMANN LANG. 

